I just tried the MAC Address Filter (under the Wi-Fi tab) and was able to deny access to my iPhone, and low and behold, I looked at my iPhone and it was no longer connected to Wi-Fi. MAC filter only works for Wi-Fi devices.
There is also a parental control feature under the Internet Tab that blocks access at certain times. I also tested this with my iPhone and while my iPhone still shows as being connected to Wi-Fi, i wasn't able to load any web pages. This feature also works for LAN devices.
So the parental control feature is likely the one you want, you can set access to be blocked at whatever time of day you wish.
Both of these features are found in advanced mode.